Transmission-gearing



UNITED )sTAilss `eATi-:irT OFFICE.

f NORMAN C. KOHR, OFCOLUMBUs; OHIO, AssiGNORTC ELECTRIC AUTOLLITECORPORA- "Tron, OF TOLEDO, OHIO, `n CORPORATION Or DELAWARE.

. l vTRAnsivussion'-ainiRriie.

specificationofteaersratent. Patented Nov. 23,1920.

Application flied .Maren is, 191s. seriaino. 222,4863.

To all 'w imm it may concern-f Beit known that I, NORMAN C. KOHR, a

, citizen of 'the United States, Yresiding at Columbus, in the county of`Franklin land .State of Ohio, have invented certainnew and usefulyImprovements in Transmission- Gearing, of which I declare the followingto be a full, clear, and exact description.

This`-.l1ivention relates to transmission 'gearing 'as employed withelectric lmotors Aforstartix'ig internal combustion engines.Thevp'rincipalobject of this invention 1s fito provide a novel andeffective `interconnecting gear between the starting motor and enginefly-wheel which will mesh and unmesh automatically and without seriousjar to the movable parts.

Further objects, vand`objects relating to economies of ,manufacture anddetails of construction willdefinitely appear from the detaileddescriptionto follow.

. I accomplish the objects of thisinvention 4by the devices .describediny the following i specification.-

Astructure constituting a preferred embodiment' of my inventionisillustrated in the', accompanying drawings, forming a part of thisspecification, inwhich l Figure I is a'sectional view through a'starting motor; showing the gear Vinl disengaged position; 4- Y i Fig.II is a similarwvlew with the motor casing removedshowingthe gear in"engage ment; 1

Fi. I'V is a detailY view taken Online IV.-VOfIiig. 4

In the drawings, similar reference numerals refer to similar partsthroughout the several views, andthe sectional views are ing a bearingat` both ends in the casing,

as at 5 and 6; The shaft 4 is hollow', and adjacent one'end has aninternalthread 7, with which is meshedwa secondary or stub shaft 8,having an externally threaded por tion 9. One end of the shaft 8 bears apinion 10 which is weighted Onone side as at 11, for a purposehereinafter described.

This pinion ldisvadapted for engagement withgeanteeth 12,4 cut ontheflywheel 13 of the engine, and is keyed to the secondary i shaft.

The end ofv the secondary shaft opposite that which bears the pinion 10has attached to it a cap 14, and adjacent this cap and encircling thesecondary shaft is a spiralA compression spring 15. A buffer ringl liesnext to the spring 15, as shown.

Mounted on one end of `the sh'aft 4C, and adapted for slidable movementthereon, is a cap 17, having cylindrical walls and an end piece 18apertured to receive the secondary shaft. Vithi/n this cap andbearing onthe end of the main shaft, is a compression spring 19.

The. secondary shaft has axial movement relative to the armature shaftby virtue of its screw threaded relationship therewith. It is limited inits outward movement by engagement of the buffer ring 16 against theoutstanding' internal screw thread at 20, and in its inner movement bythevengagement of ,the pinion and the buffer cap 17.

The' normal inactive position of the gearing as is shown in Fig. I. Whenthe motor isstarted and the armature begins to rotate, i

the inertia of the pinion will tend to hold it from'rotative movement,thereby causing Vthe secondary shaft to move inwardly on its screwthread. This inward movement of `the stub shaft brings the pinion intomesh.

` The load of the engine shaft then becomes effective and as the bufferspring ,is being compressed, the fly-wheel is gradually ac celerated upto armature speed without any Vserious jarring effects. As soon as theengine starts upunder its ownpower, the'flywheel speedisfgreatly,accelerated, resulting in a relatively greater rotative speed-in 'the secondary shaft than in the armature shaft.' .The difference ins eed relationship Acauses the secondary sha t.4 to screw outwardly fromthe main shaft until the buffer ring engages the screw thread terminal,`

when the pinion willf be in complete disengagement from the flywheel.

YI am' aware that the particular einbodiment of my invention, here shownand described, issusceptible of considerable variation without departingfrom the spirit of my invention, and, therefore, I desire to claim thesame broadly as well as specifically as indicated by the appendedclaims.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent7 is 1. In a starting system for an internalcombustion engine having a gear wheel. a driving shaft, a driven shaftscrew-threaded i thereto, a pinion. secured to said driven shaft andadapted upon initial rotation of said driving shaft to movelongitudinallyv into mesh with said gear wheel, a buffer springsurrounding said driven shaft between said pinion and said drivingshaft, and a closel)v fitting protective cap for said spring mounted onthe end ofsaid driving shaft.

2. In a starting system for an internal combustion engine having a gearwheel, a hollowdriving shaft, a driven shaft screw threaded thereinto, apinion secured to one end of said driven shaft and adapted upon initialrotation of said driving shaft to move longitudinally thereof intomeshing engagement with said gear wheel, and a compression spring withinsaidhollow driving shaft and adapted to coperate therewith and with anend portion of said driven shaft to limit the movement of said pinionwhen moving out of engagement with said gear' wheel. I

In a starting system for an internal combustion engine having .a gearwheel. a hollow driving shaft, a driven shaft screw threaded thereinto,a pinion secured to ,one end of said drivenshaft and ,adapted uponinitial rotation of said driving shaft to move toward the same intomeshing engagement with said gear wheel and a compression spring withinsaid hollow driving shaft for limiting the outward movement of saidpinion and driven shaft upon disengagement of the former from said gearwheel.

4. In a starting system for aninternal combustion engine having a gearwheel. a

hollow driving shaft upon which the, rotawithin said hollow drivingshaft for limltlng tho outward dlsengaglng n'loveinent'r of said pinion.

In a starting System -for an internal combustion engine having a gearwheel, the combination of a hollow driving shaft.y a driven-shaftscrew-threaded thereinto` a pinion serured to 011e end ol said drivenshaft and adapted upon initial rotation of said driving shaft to movelongitlulinally thereof into meshing engagement with said gear wheel, abuffer spring surrounding said driven shaft, between said pinion andsaid driving shaft, a closely fitting protective, cap for said springmounted on the end of said driving shaft, and a compression springwithin said hollow driving shaft and adapted to eoiiperate therewith andwith an end portion of said driven shaft to limit the movement of saidpinion when moving ont of engagement with said gear wheel.'

In testimonyv whereof7 I allix my signature.

NORMAN C. KOIIR.

Gel

